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Senior Java Engineer Jobs in Missouri (NOW HIRING)

Ports North

Software Engineer Java

O Fallon, MO · On-site

$82.66 - $103.32/hr

Bachelor's Degree * 4+ years of work experience Title Sr Java Developer Location O'Fallon, MO Client Industry Finance Compensation $60-75/hr About Korn Ferry Korn Ferry unleashes potential in people ...

New

Atria Group LLC

Java Developer

Saint Louis, MO · On-site

$49.50 - $64.25/hr

Unigroup is in need of a senior Java developer. They will be part of a 10+ person team developing on a large rewrite of their enterprise system along with smaller projects as well. This individual ...

w3r Consulting

Senior Software Engineer (Java)

O Fallon, MO · On-site

$116K - $153K/yr

Senior Software Engineer Location: O Fallon, MO (Hybrid 3 days in office) Duration: 6 months Top 3 Required Skills: 1. Java Full Stack Engineering * Java 8+, J2EE, Spring, Hibernate * Angular/React ...

Palnar

Backend Java Engineer W/IBM MQ Exp

O Fallon, MO · On-site

$47.25 - $61.25/hr

Senior Software Development Engineer (Specialty) - Level 7 Location: O'Fallon, MO/Hybrid Duration: 12 months * Java * Proficient in core java * Spring boot preferred. * Messaging services * MQ's or ...

Stellar IT Group

Core Java Developer

Saint Louis, MO · On-site

Remote Duration: 6+ Months Contract Role Overview We are seeking experienced Senior Core Java Developers to join our team and contribute to building secure, scalable, and production-ready ...

New

Stellar IT Solutions

Core Java Developer

Saint Louis, MO · On-site

Remote Duration: 6+ Months Contract Role Overview We are seeking experienced Senior Core Java Developers to join our team and contribute to building secure, scalable, and productionready applications.

New

MasterCard

Senior Software Engineer

O Fallon, MO

$114K - $151K/yr

We are looking for a Senior AI Java Engineer (Hands-on IC) to deliver AI-driven capabilities across our roadmap. This is a builder role requiring strong hands-on engineering-owning critical ...

Mastercard, Inc.

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

We are looking for a Senior AI Java Engineer (Hands-on IC) to deliver AI-driven capabilities across our roadmap. This is a builder role requiring strong hands-on engineering-owning critical ...

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All JobsJava Engineer JobsSenior Java Engineer JobsSenior Java Engineer Jobs in Missouri

Senior Java Engineer information

What is a senior Java engineer?

Senior Java Engineers are experienced software developers who specialize in designing, developing, and maintaining applications using the Java programming language. They often lead development teams, architect solutions, and ensure that software meets both technical and business requirements. Their responsibilities also include code reviews, mentoring junior developers, and optimizing application performance. Typically, they have several years of experience and a deep understanding of Java frameworks and best practices.

What are the key skills and qualifications needed to thrive as a senior Java engineer?

To thrive as a Senior Java Engineer, you need advanced proficiency in Java programming, strong knowledge of software design patterns, and a degree in computer science or related field. Experience with frameworks like Spring, Hibernate, build tools such as Maven or Gradle, and familiarity with cloud platforms and CI/CD systems are typically required. Excellent problem-solving abilities, leadership, and effective communication help you guide teams and collaborate with stakeholders. These skills are crucial for delivering robust, scalable software solutions and mentoring junior engineers in complex development environments.

What are some common challenges senior Java engineers face when working on large-scale enterprise applications?

Senior Java Engineers often encounter challenges such as managing complex codebases, ensuring application scalability, and maintaining high performance under heavy loads. They are also responsible for implementing robust security practices and integrating new technologies without disrupting existing systems. Effective collaboration with cross-functional teams and mentoring junior developers are crucial aspects of the role, as these responsibilities help maintain code quality and project momentum.

What is the difference between Senior Java Engineer vs Java Developer?

AspectSenior Java EngineerJava Developer
Required CredentialsBachelor's in Computer Science, Java certifications (e.g., Oracle Certified Professional)Bachelor's in Computer Science or related field, Java certifications optional
Work EnvironmentDesigning, developing, and maintaining complex Java applications, often in team leadership rolesDeveloping Java applications, focusing on coding and implementation
Industry UsageUsed across finance, tech, and enterprise sectors for large-scale projectsCommonly employed in software development firms, startups, and tech companies

While both roles involve Java programming, Senior Java Engineers typically handle complex system design, mentorship, and project leadership, whereas Java Developers focus more on coding and implementing features. The senior role often requires more experience and certifications, with a broader scope of responsibilities.

What are the most commonly searched types of Java Engineer jobs in Missouri?

The most popular types of Java Engineer jobs in Missouri are:

What cities in Missouri are hiring for Senior Java Engineer jobs?

Cities in Missouri with the most Senior Java Engineer job openings:

What are popular job titles related to Senior Java Engineer jobs in MO?

For Senior Java Engineer jobs in MO, the most frequently searched job titles are:

Senior Java Engineer jobs near you
Infographic showing various Senior Java Engineer job openings in Missouri as of August 2026, with employment types broken down into 90% Full Time, 5% Part Time, and 5% Contract. Highlights an 84% Physical, 6% Hybrid, and 10% Remote job distribution.

Software Engineer Java

Ports North

O Fallon, MO • On-site

$82.66 - $103.32/hr

Other

Posted yesterday

New

Job description

Our Client is seeking talented individuals to join our Network Solutions team in O'Fallon, MO. They are researching and developing the next generation of products and services to enable consumers to securely, efficiently, and intelligently conduct transactions regardless of channel.

Responsibilities
  • Design components by translating product requirements, break down project into tasks and provide accurate estimates
  • Independently come up with different solutions, extensible Low-level design. Write modular, extensible, readable and performant code
  • Choose the right Data Structures, tools and tech stacks and be able to do High Level Designing with guidance
  • Research new frameworks and technologies, assist with prototyping and proof-of-concepts, participate in code reviews
  • Collaborate with teams by contributing to the shared vision and working closely with cross-functional stakeholders
  • You will be responsible for the components you (and or your team) build and will support them till the time they are live in production
Required Skills
  • Excellent communication skills with the ability to communicate with all levels of management
  • Ability to build rapport and relationships
  • Someone understanding the concept of operations first, focusing on usability, operability of applications from the get-go
  • Problem solver and solution-seeking approach
  • Hands on experience in building complex and highly scalable and performing systems
  • Solid understanding and hands-on experience in Java, J2EE, Spring, Spring Boot, Kafka, RESTful web services and JPA
  • You have experience in building AI assisted application, autonomous and semi-autonomous agents and agentic workflow systems that coordinate multi-step tasks.
  • Strong belief in continuous refactoring and adhering to S.O.L.I.D design principles.
  • Exposure to building cloud ready applications (microservices)
  • Practitioner of Test Driven Development
  • Exposure to Continuous Delivery and Integration
  • Agile Scrum experience
Education & Work Experience
  • Bachelor's Degree
  • 4+ years of work experience

Title Sr Java Developer

Location O'Fallon, MO

Client Industry Finance

Compensation $60-75/hr

About Korn Ferry

Korn Ferry unleashes potential in people, teams, and organizations. We work with our clients to design optimal organization structures, roles, and responsibilities. We help them hire the right people and advise them on how to reward and motivate their workforce while developing professionals as they navigate and advance their careers. To learn more, please visit Korn Ferry at www.Kornferry.com

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